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Questions + Answers key
Take MCQ Chemistry Test
1.
If a liquid compound decomposes at its boiling point, which method(s) can you choose for its purification. It is known that the compound is stable at low pressure, steam volatile and insoluble in water.
2.
BF3 does not have proton but still acts as an acid reacts with NH3.Why is it so? What type of bond is formed between the two?
3.
The enthalpy of atomisation for the reaction,
\({ CH }_{ 4 }\left( g \right) \longrightarrow C\left( g \right) +4H\left( g \right) \)
is 1665 KJ mol-1. What is the bond energy of C-H bond ?
4.
Why does the type of overlap given in the following figure not result in bond formation
5.
Which of the following orbitals are degenerate?
6.
Volume of a solution changes with change in temparature, then will the molality of the solution be affected by temparature? Give reason for your answer.
7.
Green house effect leads to global warming.Which substances are reaponsible for green house effect?
8.
PbO2 is a stronger oxidising agent than SnO2
9.
Why is hydrogen peroxide stored in wax lined bottles?
1.
If a compound decomposes at its boiling point but is steam volatile, water-insoluble and stable at low pressure, steam distillation can be used for its purification. This technique is applied to separate substances which are steam volatile and immiscible with water.
2.
BF3 is an electron deficient compound and hence acts as Lewis acid.NH3 has one lone pair which it can donate to BF3 and form a coordinate bond. Hence, NH3 acts as lewis base.
H3N:→BF3
3.
In CH4 there are four C-H bonds. The enthalpy of atomisation of 1 mole of CH4 means dissociation of four moles of C-H bond.
∴ C-H bond energy per mol \(=\frac{ 1665 KJ}{4 mol }\)= 416.25 KJ mol-1.
4.
In the figure I are of ++ overlap is equal to +- overlap,so net overlap is zero,while in the figure II there is no overlap due to different symmetry.
5.
The orbitals which belong to same subshell and same shell are called degenerate orbitals.(3dxy,3dz2,3dyz) and (4 dxy,4 dzy,4 dz2) are the two sets of degenerate orbitals
6.
No, molality of solution does not change with temperature since mass remains unaffected with temperature.
7.
( )
Green house namely carbon dioxide,methane,nitrous oxide(N2,O),ozone and chloroflurocarbons(CFS's) are reponsible for green house effect,i.e for maintaining temperature of the earth as these absorb the outgoing radiations from the earth's surface
8.
( )
2In PbO2 and SnO2 , both lead and tin are present in +4 oxidation state, But due to stronger inert pair effect, Pb2+ ion is more stable than Sn2+ ion. In other words Pb4+ ions i.e. PbO2 is more easily reduced to Pb+2 ions than Sn4+ ions reduced to Sn2+ ions. Thus, PbO2 acts as a stronger oxidising agent than SnO2
9.
( )
Hydrogen peroxide is decomposed by rough surfaces of glass, alkali oxides present in it and light to form
\({ H }_{ 2 }O \ and \ { O }_{ 2 } \ { 2H }_{ 2 }{ O }_{ 2 }\rightarrow { 2H }_{ 2 }O+{ O }_{ 2 }\)
To prevent this decomposition, \({ H }_{ 2 }{ O }_{ 2 }\)is usually stored in coloured paraffin wax coated plastic or teflon bottles.
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